Monte Sereno, CA 95030 Frost Dates
95030, near Monte Sereno, CA: the frost window
The last spring frost here typically falls around 02/02, about 158 days from today. Fall's first freeze usually shows up around 12/06, roughly 310 days after the last spring frost.
The USDA Plant Hardiness Zone Map puts Monte Sereno in Zone 9b (25 to 30°F average annual minimum); frost dates are NOAA's 1991-2020 station normal, not this year's forecast.
Stretching the season past the first frost
Monte Sereno's growing season runs out in roughly 14 weeks — a cold frame or greenhouse kit is the usual way to keep cool-weather crops going past the first frost.
How much risk comes with planting early here
02/02 is the middle of 30 years of NOAA records, not a promise. Getting tender plants in by 03/14 carries real risk, frost has hit that late in about 9 of 10 years here. Wait until 12/31 and only about 1 year in 10 sees frost after that.
Monte Sereno against the rest of the dataset
About 310 days separate Monte Sereno's last and first frost, putting it 3,571 of 40,283 ZIP codes nationally. Within CA, it ranks 1,484 of 2,555.
Learn more
Two guides worth reading on 95030: zone vs. frost date, on why Zone 9b and Monte Sereno's frost date answer different questions, and the frost range, on how to read the range around Monte Sereno's dates instead of trusting one.